Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / wpf / src / Core / CSharp / System / Windows / Media / ColorTransform.cs / 1305600 / ColorTransform.cs
//------------------------------------------------------------------------------ // Microsoft Windows Client Platform // Copyright (c) Microsoft Corporation, 2001, 2002, 2003 // // File: ColorTransform.cs //----------------------------------------------------------------------------- using System; using System.IO; using System.Runtime.InteropServices; using System.Windows.Media; using System.Windows.Media.Imaging; using MS.Internal; using MS.Win32; using System.Security; using System.Security.Permissions; using System.Collections; using System.ComponentModel; using System.ComponentModel.Design.Serialization; using System.Reflection; using System.Diagnostics; using System.Globalization; using Microsoft.Win32.SafeHandles; using UnsafeNativeMethods=MS.Win32.PresentationCore.UnsafeNativeMethods; namespace System.Windows.Media { ////// internal class ColorTransform { //----------------------------------------------------- // // Constructors // //----------------------------------------------------- #region Constructors private ColorTransform() { } ////// SecurityCritical: This code calls critical code (unmanaged) /// SecurityTreatAsSafe: Call passes in managed ColorContext to unmanaged code which is safe /// The _colorTransformHelper comes out of an elevation and is stored locally /// in a variable whose access is tracked to prevent any malicious tampering. /// And that constructing this object is inherently a safe operation. /// [SecurityCritical, SecurityTreatAsSafe] internal ColorTransform(ColorContext srcContext, ColorContext dstContext) { InitializeICM(); if (srcContext == null) { srcContext = new ColorContext(PixelFormats.Bgra32); } if (dstContext == null) { dstContext = new ColorContext(PixelFormats.Bgra32); } _inputColorType = srcContext.ColorType; _outputColorType = dstContext.ColorType; _colorTransformHelper.CreateTransform(srcContext.ProfileHandle, dstContext.ProfileHandle); } ////// SecurityCritical: This code calls critical code (unmanaged) /// SecurityTreatAsSafe: All parameters to unmanaged call are generated inside of the method and are safe /// The _colorTransformHelper comes out of an elevation and is stored locally /// in a variable whose access is tracked to prevent any malicious tampering. /// And that constructing this object is inherently a safe operation. /// [SecurityCritical, SecurityTreatAsSafe] internal ColorTransform(SafeMILHandle bitmapSource, ColorContext srcContext, ColorContext dstContext, System.Windows.Media.PixelFormat pixelFormat) { InitializeICM(); if (srcContext == null) { srcContext = new ColorContext(pixelFormat); } if (dstContext == null) { dstContext = new ColorContext(pixelFormat); } _inputColorType = srcContext.ColorType; _outputColorType = dstContext.ColorType; //if this failed or the handle is invalid, we can't continue if (srcContext.ProfileHandle != null && !srcContext.ProfileHandle.IsInvalid) { //if this failed or the handle is invalid, we can't continue if (dstContext.ProfileHandle != null && !dstContext.ProfileHandle.IsInvalid) { _colorTransformHelper.CreateTransform(srcContext.ProfileHandle, dstContext.ProfileHandle); } } } #endregion //------------------------------------------------------ // // Public Methods // //----------------------------------------------------- #region Public Methods #endregion //------------------------------------------------------ // // Internal Methods // //------------------------------------------------------ #region Internal Methods ////// SecurityCritical: This code calls critical code (unmanaged) /// SecurityTreatAsSafe: All parameters to unmanaged call are generated inside of the method and are safe /// The _colorTransformHelper comes out of an elevation and is stored locally /// in a variable whose access is tracked to prevent any malicious tampering. /// And that constructing this object is inherently a safe operation. /// [SecurityCritical, SecurityTreatAsSafe] internal void Translate(float[] srcValue, float[] dstValue) { // 3. create Win32 unmanaged profile handle from memory source profile using OpenColorProfileW IntPtr[] pProfiles = new IntPtr[2]; IntPtr paInputColors = IntPtr.Zero; IntPtr paOutputColors = IntPtr.Zero; try { // 6. transform colors using TranslateColors UInt32 numColors = 1; long inputColor = ICM2Color(srcValue); paInputColors = Marshal.AllocHGlobal(64); Marshal.WriteInt64(paInputColors, inputColor); paOutputColors = Marshal.AllocHGlobal(64); long outputColor = 0; Marshal.WriteInt64(paOutputColors, outputColor); _colorTransformHelper.TranslateColors( (IntPtr)paInputColors, numColors, _inputColorType, (IntPtr)paOutputColors, _outputColorType ); outputColor = Marshal.ReadInt64(paOutputColors); for (int i = 0; i < dstValue.GetLength(0); i++) { UInt32 result = 0x0000ffff & (UInt32)(outputColor >> (16 * i)); float a = (result & 0x7fffffff) / (float)(0x10000); if (result < 0) dstValue[i] = -a; else dstValue[i] = a; } } finally { Marshal.FreeHGlobal(paInputColors); Marshal.FreeHGlobal(paOutputColors); } } #endregion Internal Methods //----------------------------------------------------- // // Private Methods // //------------------------------------------------------ #region Private Methods ////// SecurityCritical: This code calls critical code (unmanaged) /// [SecurityCritical] private void InitializeICM() { _colorTransformHelper = new ColorTransformHelper(); } private long ICM2Color(float[] srcValue) { long colorValue; if (srcValue.GetLength(0) < 3 || srcValue.GetLength(0) > 8) { throw new NotSupportedException(); // Only support color spaces with 3,4,5,6,7,8 channels } if (srcValue.GetLength(0) <= 4) { UInt16[] channel = new UInt16[4]; channel[0] = channel[1] = channel[2] = channel[3] = 0; for (int i = 0; i < srcValue.GetLength(0); i++) { if (srcValue[i] >= 1.0)// this fails for values above 1.0 and below 0.0 { channel[i] = 0xffff; } else if (srcValue[i] <= 0.0) { channel[i] = 0x0; } else { channel[i] = (UInt16)(srcValue[i] * (float)0xFFFF); } } colorValue = (long)(((UInt64)channel[3] << 48) + ((UInt64)channel[2] << 32) + ((UInt64)channel[1] << 16) + (UInt64)channel[0]); } else { byte[] channel = new byte[8]; channel[0] = channel[1] = channel[2] = channel[3] = channel[4] = channel[5] = channel[6] = channel[7] = 0; for (int i = 0; i < srcValue.GetLength(0); i++) { if (srcValue[i] >= 1.0)// this fails for values above 1.0 and below 0.0 { channel[i] = 0xff; } else if (srcValue[i] <= 0.0) { channel[i] = 0x0; } else { channel[i] = (byte)(srcValue[i] * (float)0xFF); } } colorValue = (long)(((UInt64)channel[7] << 56) + ((UInt64)channel[6] << 48) + ((UInt64)channel[5] << 40) + ((UInt64)channel[4] << 32) + ((UInt64)channel[3] << 24) + ((UInt64)channel[2] << 16) + ((UInt64)channel[1] << 8) + ((UInt64)channel[0] << 0)); } return colorValue; } #endregion //----------------------------------------------------- // // Private Fields // //----------------------------------------------------- #region Private Fields ////// SecurityCritical: This comes out of an elevation needs to be critical and tracked. /// [SecurityCritical] private ColorTransformHelper _colorTransformHelper; private UInt32 _inputColorType; private UInt32 _outputColorType; #endregion } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. 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